import numpy as np
import pandas as pd

if __name__ == '__main__':
    nu=np.arange(0,12)

    nu=np.reshape(nu,[3,4])
    print(nu)
    # nu2=nu[:, [0, 3]]
    # nu2[[0,2],:]

    # print(nu2[[0,2],:])

    # print(nu[::2,:])
    # a=[1,3]
    # print(nu.mean(axis=0))
    # print(nu[:,0:-1])

    # n2=np.insert(nu,[1,3],666,axis=1)
    # print(slice(2,3))
    print(np.power(nu[:,2], 2))